audio speakers-on-a-chip conexants portfolio includes a comprehensive suite of semiconductor solutions for communications and consumer applications. the CX20705 is one of conexants speakers-on-a-chip (spoc) embedded audio solutions for designing 2.1 channel audio entertainment applications. the device features a proprietary digital signal processor (dsp), codec, stereo 2.5 watt class-d amplifier, capless headphone driver, digital crossover, and i 2 s, usb, and i 2 c interfaces in a cost-effective single-chip package. the solution features a suite of turnkey audio post-processing effects specifically designed for 2.1 channel audio entertainment applications such as smartphone/ipod docking systems and all-in-one speakers. this product is part of the cx2070x spoc family, which includes cx20702, cx20703, cx20704, cx20706, cx20707 and cx20709. the device features multiple high performance 24-bit dacs for 2.1 channel speaker output, multiple 24-bit high performance adcs supporting up to three stereo line inputs, capless headphone output, support for bi-directional i 2 s, pcm, s/pdif-out with independent sampling rates, and a range of digital and analog input/output channel selections for flexible routing and mixing. the integrated digital crossover supports sub-woofer configuration. different audio sampling rates ranging from 8 khz to 96 khz are generated directly from the master clock without the need for external pll. the power-efficient class-d amplifier drives a maximum of 2.5 w (average) stereo from the integrated amplifier. the spoc can be controlled and configured by both read and write capability through i 2 c and serial peripheral interface (spi). the usb interface is usb 2.0 audio class compliant for both control and data. the on-chip digital signal processor (dsp) runs a suite of innovative conexant proprietary audio post processing effects that dramatically improves sound quality and frees-up processing power for other applications without compromising on cost and future firmware scalability. key audio innovations include equalizer, dynamic range compression, digital crossover, and 3d effects. the embedded spoc configuration toolbox allows for fast configuration and performance optimization. the CX20705 turnkey solution eliminates the need for a multiple-chip reference design, making it easy and economical for manufacturers to design products for high quality audio applications. a complete evaluation kit with reference board and all the necessary technical documents and software is available. the soc is packaged in an environmentally-friendly, rohs/green-compliant 76-pin qfn (quad flat no leads) package. applications ? 2.1 channel smartphone/ipod docking systems ? 2.1 channel all-in-one pc speaker distinguishing features ? 24-bit dac/four adc, snr 102 db, thd - 92 db at 48 khz 3.3 v ? programmable on-chip proprietary dsp C digital equalizer (10 bands/ channel) C dynamic range compression C digital crossover C 3d expander (phantom mode and immersion mode) ? usb 2.0 compliant audio class interface ? one 2-wire i 2 c or 4-wire spi slave interface for external mcu ? 3-wire digital audio i/o (i 2 s/pcm/spdif), supporting half-duplex receive-only traffic ? stereo 2.5 w btl class-d speaker amplifier ? flexible power management ? audio sample rate: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48, 64, 88.2, 96 khz part number CX20705 description speakers-on-a-chip with on-chip audio dsp, integrated i 2 s/i 2 c/usb codec, and class-d amplifier speakers-on-a-chip with on-chip audio dsp, integrated i 2 s/i 2 c/usb codec, and class-d amplifier CX20705 free datasheet http:///
? 2009 conexant systems, inc. all rights reserved. conexant and the conexant logo are registered trademarks of conexant systems, inc. all other trademarks are owned by their respective owners. although conexant strives for accuracy in all its publications, this material may contain errors or omissions and is subject to change without notice. this m at eria l is p rovided a s is and without an y exp ress or implied w arrant ies, includin g merch antabilit y, fi tn ess for a pa r ticular purpose and non-infringement . conexant shall not be liable for any special, indirect, incidental or consequential damages as a result of its use. CX20705 interface diagram dma dsp memory dsp dma dac dac dac controller dma spi i 2 c slave uart jack sense clock circuitry mon adc i 2 s clk rx_ws rx_dat usb usb+ usb- usb detect scl rx tx eeprom clk eeprom data csn miso mos/sda gpio 0 gpio 1 matrix 0 matrix 1 matrix 2 volume voltage monitor se or diff 10 kw line se or diff 10 kw line 2.5w class-d capless hp out 32 w se or diff 600 w or 10 kw line capless hp out 32 w 2.5w class-d xtal in/ master in xtal out sense 3 se or diff line in se or diff line in se line in m m m 3 se or diff line in se or diff line in se line in m m m gpio 2 gpio 3 gpio 4 adc adc 09-2896 audio speakers-on-a-chip www.conexant.com general information: u.s. and canada: (888) 855-4562 international: 1+ (949) 483-3000 headquarters 4000 macarthur blvd. newport beach, ca 92660 doc# pbr-202397 CX20705 f eatures codec ? 3-wire digital audio i/o (i 2 s/pcm/spdif), supporting half- duplex receive-only traffc s /ne wire) 2 c or 4-wire spi slave interface for external mcu s 53 ompliant udio lass interface s ight 0)/pins s 3tereo 74,lass speakerampliler s 3ingleended or differentialstereoanalogaudioinput s )ntegrated m7headphone drierwith acksense s bit 3.2 d 4(datk( 6 s udio samplerate 88.2, 96 khz s ddnamicrangewith percent 4(.at ? load s 3pread 3pectrum for llterless low-)output s bit multiplexedtosupportanalog olume potentiometer and dc level detection s lexible powermanagement s 6ariable master cockrates dsp ? digital equalizer (10 bands/channel) ? dynamic range compression ? digital crossover s xpander 0hantom mode and )mmersion mode spoc confguration toolbox ? fast confguration tool via usb-to-i 2 c from pc s eice conlgurationand30parameteradustment s /utput log for conenient-5programming the CX20705 is offered in a 76-pin qfn package conexant product portfolio conexants comprehensive product portfolio includes solutions for imaging, audio, embedded modem and video surveillance applications. free datasheet http:///
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